dev-qt/qtgui: Fix libinput wheelevents

Patch taken from 5.9 branch (fixed in 5.9.5).

KDE-Bug: https://bugs.kde.org/show_bug.cgi?id=386762
Qt-Bug: https://bugreports.qt.io/browse/QTBUG-59261
See also: https://codereview.qt-project.org/#/c/212398/

Package-Manager: Portage-2.3.24, Repoman-2.3.6
Closes: https://github.com/gentoo/gentoo/pull/7109

2 files changed, 242 insertions, 0 deletions

diff --git a/dev-qt/qtgui/files/qtgui-5.9.4-libinput-pixeldelta.patch b/dev-qt/qtgui/files/qtgui-5.9.4-libinput-pixeldelta.patch
new file mode 100644
index 000000000000..b9adb8b2f623
--- /dev/null
+++ b/dev-qt/qtgui/files/qtgui-5.9.4-libinput-pixeldelta.patch
@@ -0,0 +1,68 @@
+From d196036024697a75868c1f1626525710495ca428 Mon Sep 17 00:00:00 2001
+From: Allan Sandfeld Jensen <allan.jensen@qt.io>
+Date: Thu, 23 Nov 2017 14:25:04 +0100
+Subject: [PATCH] Avoid providing bad pixelDeltas on X11
+
+With libinput we now get a hardcoded resolution that is unrelated to
+the hardware. So avoid using that as a real pixel delta and document
+pixel deltas as being driver specific and unreliable on X11.
+
+Task-number: QTBUG-59261
+Change-Id: I9fe86d80e7ccd290ed2e4091d7eafa52cb537d34
+Reviewed-by: David Edmundson <davidedmundson@kde.org>
+Reviewed-by: Marco Martin <mart@kde.org>
+Reviewed-by: Gatis Paeglis <gatis.paeglis@qt.io>
+---
+ src/gui/kernel/qevent.cpp                        |  1 +
+ src/plugins/platforms/xcb/qxcbconnection_xi2.cpp | 14 ++++++++------
+ 2 files changed, 9 insertions(+), 6 deletions(-)
+
+diff --git a/src/gui/kernel/qevent.cpp b/src/gui/kernel/qevent.cpp
+index 06d52aa..c68f9af 100644
+--- a/src/gui/kernel/qevent.cpp
++++ b/src/gui/kernel/qevent.cpp
+@@ -971,6 +971,7 @@ QWheelEvent::QWheelEvent(const QPointF &pos, const QPointF& globalPos,
+     \li scrolling is about to begin, but the distance did not yet change (Qt::ScrollBegin),
+     \li or scrolling has ended and the distance did not change anymore (Qt::ScrollEnd).
+     \endlist
++    \note On X11 this value is driver specific and unreliable, use angleDelta() instead
+ */
+ 
+ /*!
+diff --git a/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp b/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
+index d1d97af..94f543f 100644
+--- a/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
++++ b/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
+@@ -953,10 +953,12 @@ void QXcbConnection::xi2HandleScrollEvent(void *event, ScrollingDevice &scrollin
+                     double delta = scrollingDevice.lastScrollPosition.y() - value;
+                     scrollingDevice.lastScrollPosition.setY(value);
+                     angleDelta.setY((delta / scrollingDevice.verticalIncrement) * 120);
+-                    // We do not set "pixel" delta if it is only measured in ticks.
+-                    if (scrollingDevice.verticalIncrement > 1)
++                    // With most drivers the increment is 1 for wheels.
++                    // For libinput it is hardcoded to a useless 15.
++                    // For a proper touchpad driver it should be in the same order of magnitude as 120
++                    if (scrollingDevice.verticalIncrement > 15)
+                         rawDelta.setY(delta);
+-                    else if (scrollingDevice.verticalIncrement < -1)
++                    else if (scrollingDevice.verticalIncrement < -15)
+                         rawDelta.setY(-delta);
+                 }
+             }
+@@ -965,10 +967,10 @@ void QXcbConnection::xi2HandleScrollEvent(void *event, ScrollingDevice &scrollin
+                     double delta = scrollingDevice.lastScrollPosition.x() - value;
+                     scrollingDevice.lastScrollPosition.setX(value);
+                     angleDelta.setX((delta / scrollingDevice.horizontalIncrement) * 120);
+-                    // We do not set "pixel" delta if it is only measured in ticks.
+-                    if (scrollingDevice.horizontalIncrement > 1)
++                    // See comment under vertical
++                    if (scrollingDevice.horizontalIncrement > 15)
+                         rawDelta.setX(delta);
+-                    else if (scrollingDevice.horizontalIncrement < -1)
++                    else if (scrollingDevice.horizontalIncrement < -15)
+                         rawDelta.setX(-delta);
+                 }
+             }
+-- 
+2.7.4
+
diff --git a/dev-qt/qtgui/qtgui-5.9.4-r2.ebuild b/dev-qt/qtgui/qtgui-5.9.4-r2.ebuild
new file mode 100644
index 000000000000..35f85253adaf
--- /dev/null
+++ b/dev-qt/qtgui/qtgui-5.9.4-r2.ebuild
@@ -0,0 +1,174 @@
+# Copyright 1999-2018 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+QT5_MODULE="qtbase"
+inherit qt5-build
+
+DESCRIPTION="The GUI module and platform plugins for the Qt5 framework"
+
+if [[ ${QT5_BUILD_TYPE} == release ]]; then
+	KEYWORDS="~amd64 ~arm ~arm64 ~hppa ~ppc ~ppc64 ~x86"
+fi
+
+# TODO: linuxfb
+
+IUSE="accessibility dbus egl eglfs evdev +gif gles2 ibus
+	jpeg +libinput +png tslib tuio +udev vnc +xcb"
+REQUIRED_USE="
+	|| ( eglfs xcb )
+	accessibility? ( dbus xcb )
+	eglfs? ( egl )
+	ibus? ( dbus )
+	libinput? ( udev )
+	xcb? ( gles2? ( egl ) )
+"
+
+RDEPEND="
+	dev-libs/glib:2
+	~dev-qt/qtcore-${PV}
+	media-libs/fontconfig
+	>=media-libs/freetype-2.6.1:2
+	>=media-libs/harfbuzz-1.0.6:=
+	>=sys-libs/zlib-1.2.5
+	virtual/opengl
+	dbus? ( ~dev-qt/qtdbus-${PV} )
+	egl? ( media-libs/mesa[egl] )
+	eglfs? (
+		media-libs/mesa[gbm]
+		x11-libs/libdrm
+	)
+	evdev? ( sys-libs/mtdev )
+	gles2? ( media-libs/mesa[gles2] )
+	jpeg? ( virtual/jpeg:0 )
+	libinput? (
+		dev-libs/libinput:=
+		x11-libs/libxkbcommon
+	)
+	png? ( media-libs/libpng:0= )
+	tslib? ( x11-libs/tslib )
+	tuio? ( ~dev-qt/qtnetwork-${PV} )
+	udev? ( virtual/libudev:= )
+	vnc? ( ~dev-qt/qtnetwork-${PV} )
+	xcb? (
+		x11-libs/libICE
+		x11-libs/libSM
+		x11-libs/libX11
+		>=x11-libs/libXi-1.7.5
+		>=x11-libs/libxcb-1.10:=[xkb]
+		>=x11-libs/libxkbcommon-0.4.1[X]
+		x11-libs/xcb-util-image
+		x11-libs/xcb-util-keysyms
+		x11-libs/xcb-util-renderutil
+		x11-libs/xcb-util-wm
+	)
+"
+DEPEND="${RDEPEND}
+	evdev? ( sys-kernel/linux-headers )
+	udev? ( sys-kernel/linux-headers )
+"
+PDEPEND="
+	ibus? ( app-i18n/ibus )
+"
+
+PATCHES=(
+	"${FILESDIR}/${P}-qsimpledrag.patch" # QTBUG-66103
+	"${FILESDIR}/${P}-libinput-pixeldelta.patch" # QTBUG-59261
+)
+
+QT5_TARGET_SUBDIRS=(
+	src/gui
+	src/openglextensions
+	src/platformheaders
+	src/platformsupport
+	src/plugins/generic
+	src/plugins/imageformats
+	src/plugins/platforms
+	src/plugins/platforminputcontexts
+)
+
+QT5_GENTOO_CONFIG=(
+	accessibility:accessibility-atspi-bridge
+	egl
+	eglfs
+	eglfs:eglfs_egldevice:
+	eglfs:eglfs_gbm:
+	evdev
+	evdev:mtdev:
+	:fontconfig
+	:system-freetype:FREETYPE
+	!:no-freetype:
+	!gif:no-gif:
+	gles2::OPENGL_ES
+	gles2:opengles2:OPENGL_ES_2
+	!:no-gui:
+	:system-harfbuzz:HARFBUZZ
+	!:no-harfbuzz:
+	jpeg:system-jpeg:IMAGEFORMAT_JPEG
+	!jpeg:no-jpeg:
+	libinput
+	libinput:xkbcommon-evdev:
+	:opengl
+	png:png:
+	png:system-png:IMAGEFORMAT_PNG
+	!png:no-png:
+	tslib
+	udev:libudev:
+	xcb:xcb:
+	xcb:xcb-glx:
+	xcb:xcb-plugin:
+	xcb:xcb-render:
+	xcb:xcb-sm:
+	xcb:xcb-xlib:
+	xcb:xinput2:
+	xcb::XKB
+)
+
+QT5_GENTOO_PRIVATE_CONFIG=(
+	:gui
+)
+
+src_prepare() {
+	# egl_x11 is activated when both egl and xcb are enabled
+	use egl && QT5_GENTOO_CONFIG+=(xcb:egl_x11) || QT5_GENTOO_CONFIG+=(egl:egl_x11)
+
+	qt_use_disable_config dbus dbus \
+		src/platformsupport/themes/genericunix/genericunix.pri
+
+	qt_use_disable_config tuio udpsocket src/plugins/generic/generic.pro
+
+	qt_use_disable_mod ibus dbus \
+		src/plugins/platforminputcontexts/platforminputcontexts.pro
+
+	use vnc || sed -i -e '/SUBDIRS += vnc/d' \
+		src/plugins/platforms/platforms.pro || die
+
+	qt5-build_src_prepare
+}
+
+src_configure() {
+	local myconf=(
+		$(usex dbus -dbus-linked '')
+		$(qt_use egl)
+		$(qt_use eglfs)
+		$(usex eglfs '-gbm -kms' '')
+		$(qt_use evdev)
+		$(qt_use evdev mtdev)
+		-fontconfig
+		-system-freetype
+		$(usex gif '' -no-gif)
+		-gui
+		-system-harfbuzz
+		$(qt_use jpeg libjpeg system)
+		$(qt_use libinput)
+		$(qt_use libinput xkbcommon-evdev)
+		-opengl $(usex gles2 es2 desktop)
+		$(qt_use png libpng system)
+		$(qt_use tslib)
+		$(qt_use udev libudev)
+		$(qt_use xcb xcb system)
+		$(qt_use xcb xkbcommon-x11 system)
+		$(usex xcb '-xcb-xlib -xinput2 -xkb' '')
+	)
+	qt5-build_src_configure
+}